anybody know where i can buy a nitrous fitting?

i got a used zex kit of corral a while back and all i need is a fitting to connect the line to the bottle. i think its a -4an line, with a regular zex 10lb bottle, but i cant for the life of me find it. nothing on the zex site, ive been to every plumbing and car shop in town and nothing. anybody know where i can get this?
 
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